document "how to add person to the people's page"
One of the recurring task when onboarding new people (see also tpo/tpa/team#40129) is "add that user to the people page". This seemingly trivial thing for us is actually quite a challenge for new people.
Let's make a tutorial, step by step, with no prior technical knowledge required (other than "I know how to use a web browser", say), on how to do something like this in GitLab.
This will also serve as a good example on the general "how do I change the website" problem.
I'm not sure where this should be documented, but there is already related documentation in the static shim docs (e.g. Deploying a static site from GitLab CI) but those (three!) tutorials really are more like How-To, as they assume lots of technical knowledge, and are really more one-time things. So those should be moved out of the tutorial section as well.